Number of n X 2 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.
A268898
Number of n X 2 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.
Terms
- a(0) =3a(1) =36a(2) =240a(3) =1344a(4) =6912a(5) =33792a(6) =159744a(7) =737280a(8) =3342336a(9) =14942208a(10) =66060288a(11) =289406976a(12) =1258291200a(13) =5435817984a(14) =23353884672a(15) =99857989632a(16) =425201762304
External references
- oeis: A268898